i'm dan ashley from thanks for joining us. >>> tonight on "world news," target libya. president obama throws down a gauntlet to moammar gadhafi, telling him pull back, or the british, the u.s., the french, the arabs will all move in. >> let me be clear. these terms are not negotiable. >>> inside hell. for the first time, hear from the workers trapped inside those nuclear reactors when the earthquake hit. and tonight, the head of that plant breaks down in front of the cameras. >>> prince william speaking out and sharing what his grandmother told him about getting through the tough times. >>> and, everyday hero. how one man took one failing school and changed the future of all these kids in just five words. he's our "person of the week." >>> good evening. for one week now, we have been focused on the dangerous unknowns of the nuclear crisis in japan. but tonight, we begin with the unpredictable and dangerous mind of moammar gadhafi. today, president obama told americans that u.s. forces may be called into military action once again, this time, against gadhafi. joining ot